Support a inmemory p0 partition encompassing all nodes in the cluster. This will be used by leadership manager and other usecases
that need strong consistency for coordination and not durable storage

Change-Id: I8e590e46d82a3d43cae3157a04be820bb7e1b175
diff --git a/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DatabasePartitioner.java b/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DatabasePartitioner.java
index cd0525e..a76a4e3 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DatabasePartitioner.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/consistent/impl/DatabasePartitioner.java
@@ -18,10 +18,9 @@
 
 import static com.google.common.base.Preconditions.checkState;
 
-import java.util.Map;
-
+import java.util.List;
 import com.google.common.base.Charsets;
-import com.google.common.collect.ImmutableSortedMap;
+import com.google.common.collect.ImmutableList;
 import com.google.common.hash.Hashing;
 
 /**
@@ -32,11 +31,11 @@
  */
 public abstract class DatabasePartitioner implements Partitioner<String> {
     // Database partitions sorted by their partition name.
-    protected final Database[] sortedPartitions;
+    protected final List<Database> partitions;
 
-    public DatabasePartitioner(Map<String, Database> partitionMap) {
-        checkState(partitionMap != null && !partitionMap.isEmpty(), "Partition map cannot be null or empty");
-        sortedPartitions = ImmutableSortedMap.<String, Database>copyOf(partitionMap).values().toArray(new Database[]{});
+    public DatabasePartitioner(List<Database> partitions) {
+        checkState(partitions != null && !partitions.isEmpty(), "Partitions cannot be null or empty");
+        this.partitions = ImmutableList.copyOf(partitions);
     }
 
     protected int hash(String key) {